Wolves were convinced they should have had a penalty in added time, after United goalkeeper Andre Onana clattered into Sasa Kalajdzic in trying to deal with a cross.
Hooper was the on-field referee and Salisbury and West were tasked with Video Assistant Referee (VAR) duties.
"Jon Moss said it was a blatant penalty and should have been given - fair play to him, he apologised," O'Neil told reporters.
But fair play to Jon for coming out and saying it was a clear and obvious error - he couldn't believe the on-field referee didn't give it and can't believe VAR didn't intervene.
Salisbury was also dropped for a round of fixtures in April after Brighton & Hove Albion were denied a penalty in a 2-1 defeat by Tottenham Hotspur.
Persons:
Sasa Kalajdzic remonstrates, Simon Hooper, Dylan Martinez, Michael Salisbury, Richard West, Andre Onana clattered, Sasa Kalajdzic, Hooper, Gary O'Neil, Jon Moss, O'Neil, Jon, didn't, Salisbury, Aadi Nair, Ed Osmond
Organizations:
Soccer Football, Premier League, Manchester United, Wolverhampton Wanderers, Old, REUTERS, Monday, Wolves, United, Salisbury, Brighton & Hove Albion, Tottenham Hotspur, Thomson
Locations:
Old Trafford, Manchester, Britain, West, Bengaluru